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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "timing.h"
#ifdef GIT_WIN32
#define TICKS_PER_SECOND 1000
int git_stopwatch_start(git_stopwatch *s)
{
/* Try first to use the high-performance counter */
if (!QueryPerformanceFrequency(&s->freq) ||
!QueryPerformanceCounter(&s->start)) {
/* Fall back to GetTickCount */
s->freq.QuadPart = 0;
s->start.LowPart = GetTickCount();
}
s->running = 1;
return 0;
}
int git_stopwatch_query(double *out_elapsed_seconds, git_stopwatch *s)
{
LARGE_INTEGER end;
double elapsed_seconds;
if (!s->running) {
giterr_set(GITERR_INVALID, "Stopwatch is not running");
return -1;
}
if (s->freq.QuadPart) {
if (!QueryPerformanceCounter(&end)) {
giterr_set(GITERR_OS, "Unable to read performance counter");
return -1;
}
elapsed_seconds = (end.QuadPart - s->start.QuadPart) / (double)s->freq.QuadPart;
} else {
DWORD end_ticks = GetTickCount();
/* Unsigned subtraction handles tick count wraparound */
elapsed_seconds = (end_ticks - s->start.LowPart) / (double)TICKS_PER_SECOND;
}
/* Just to be on the safe side */
if (elapsed_seconds < 0)
elapsed_seconds = 0;
*out_elapsed_seconds = elapsed_seconds;
return 0;
}
#elif __APPLE__
int git_stopwatch_start(git_stopwatch *s)
{
(void)mach_timebase_info(&s->info);
s->start = mach_absolute_time();
s->running = 1;
return 0;
}
int git_stopwatch_query(double *out_elapsed_seconds, git_stopwatch *s)
{
uint64_t end;
double elapsed_seconds;
if (!s->running) {
giterr_set(GITERR_INVALID, "Stopwatch is not running");
return -1;
}
end = mach_absolute_time();
elapsed_seconds = 0;
if (end > start) {
elapsed_seconds = (double)s->info.numer * (end - start);
elapsed_seconds /= (double)s->info.denom * 1E9L;
}
*out_elapsed_seconds = elapsed_seconds;
return 0;
}
#else
int git_stopwatch_start(git_stopwatch *s)
{
if (clock_gettime(CLOCK_MONOTONIC, &s->start)) {
giterr_set(GITERR_OS, "Unable to get the monotonic timer");
return -1;
}
s->running = 1;
return 0;
}
int git_stopwatch_query(double *out_elapsed_seconds, git_stopwatch *s)
{
struct timespec end, elapsed;
double elapsed_seconds;
if (!s->running) {
giterr_set(GITERR_INVALID, "Stopwatch is not running");
return -1;
}
if (clock_gettime(CLOCK_MONOTONIC, &end)) {
giterr_set(GITERR_OS, "Unable to get the monotonic timer");
return -1;
}
elapsed_seconds = 0;
/* If end < start, then we consider the elapsed time to be zero */
if (end.tv_sec > s->start.tv_sec ||
(end.tv_sec == s->start.tv_sec && end.tv_nsec > s->start.tv_nsec)) {
elapsed.tv_sec = end.tv_sec - s->start.tv_sec;
elapsed.tv_nsec = end.tv_nsec - s->start.tv_nsec;
if (elapsed.tv_nsec < 0) {
elapsed.tv_sec--;
elapsed.tv_nsec += 1E9L;
}
elapsed_seconds = (double)elapsed.tv_sec + elapsed.tv_nsec / (double)1E9;
}
*out_elapsed_seconds = elapsed_seconds;
return 0;
}
#endif
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